Role of iron(III) and aluminum hydroxides in concentration/reduction of Au(III) complexes

Akiko Uchida; Takushi Yokoyama; Yoshinobu Motomura; Akane Miyazaki; Yoshihiro Okaue; Koichiro Watanabe; Eiji Izawa

doi:10.1111/j.1751-3928.2002.tb00132.x

Role of iron(III) and aluminum hydroxides in concentration/reduction of Au(III) complexes

Akiko Uchida, Takushi Yokoyama, Yoshinobu Motomura, Akane Miyazaki, Yoshihiro Okaue, Koichiro Watanabe, Eiji Izawa

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

The adsorption of gold on iron(III) and aluminum hydroxides from solutions containing Au(III) complexes has been studied as a function of pH and chloride concentration at 30°C. Iron(III) hydroxide was more effective in adsorbing gold from solution than aluminum hydroxide. However, both hydroxides controlled the behavior of Au(III) complex with very similar manner. The most effective gold adsorption occurred in aqueous solution with near neutral pH and low Cl concentration. In this solution condition, Au(III) complexes were mainly dissolved as AuCl₂(OH)₂-and AuCl(OH)₃-, and the surface charge for both hydroxides was positive. In addition, the adsorbed Au(III) complexes were spontaneously reduced to elemental gold in spite of the absence of a specific reducing agent. The results of this study suggest that adsorption and spontaneous reduction of gold complexes on the surface of hydrous metal oxides with positive charge play an important role in gold precipitation in subsurface environment.

Original language	English
Pages (from-to)	223-230
Number of pages	8
Journal	Resource Geology
Volume	52
Issue number	3
DOIs	https://doi.org/10.1111/j.1751-3928.2002.tb00132.x
Publication status	Published - 2002

All Science Journal Classification (ASJC) codes

Geology
Geochemistry and Petrology

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10.1111/j.1751-3928.2002.tb00132.x

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title = "Role of iron(III) and aluminum hydroxides in concentration/reduction of Au(III) complexes",

abstract = "The adsorption of gold on iron(III) and aluminum hydroxides from solutions containing Au(III) complexes has been studied as a function of pH and chloride concentration at 30°C. Iron(III) hydroxide was more effective in adsorbing gold from solution than aluminum hydroxide. However, both hydroxides controlled the behavior of Au(III) complex with very similar manner. The most effective gold adsorption occurred in aqueous solution with near neutral pH and low Cl concentration. In this solution condition, Au(III) complexes were mainly dissolved as AuCl2(OH)2-and AuCl(OH)3-, and the surface charge for both hydroxides was positive. In addition, the adsorbed Au(III) complexes were spontaneously reduced to elemental gold in spite of the absence of a specific reducing agent. The results of this study suggest that adsorption and spontaneous reduction of gold complexes on the surface of hydrous metal oxides with positive charge play an important role in gold precipitation in subsurface environment.",

author = "Akiko Uchida and Takushi Yokoyama and Yoshinobu Motomura and Akane Miyazaki and Yoshihiro Okaue and Koichiro Watanabe and Eiji Izawa",

note = "Funding Information: Supported by NIDDK cooperative agreements (Grants DK097780, DK097772, DK097779, DK099932, DK100011, DK100017, DK097776, DK099879), NIDDK Grant K23-DK110417 and in part by NIH (National Institutes of Health) NCATS (National Center for Advancing Translational Sciences) Grant UL1TR001422. ",

year = "2002",

doi = "10.1111/j.1751-3928.2002.tb00132.x",

language = "English",

volume = "52",

pages = "223--230",

journal = "Resource Geology",

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publisher = "Wiley-Blackwell",

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TY - JOUR

T1 - Role of iron(III) and aluminum hydroxides in concentration/reduction of Au(III) complexes

AU - Uchida, Akiko

AU - Yokoyama, Takushi

AU - Motomura, Yoshinobu

AU - Miyazaki, Akane

AU - Okaue, Yoshihiro

AU - Watanabe, Koichiro

AU - Izawa, Eiji

N1 - Funding Information: Supported by NIDDK cooperative agreements (Grants DK097780, DK097772, DK097779, DK099932, DK100011, DK100017, DK097776, DK099879), NIDDK Grant K23-DK110417 and in part by NIH (National Institutes of Health) NCATS (National Center for Advancing Translational Sciences) Grant UL1TR001422.

PY - 2002

Y1 - 2002

N2 - The adsorption of gold on iron(III) and aluminum hydroxides from solutions containing Au(III) complexes has been studied as a function of pH and chloride concentration at 30°C. Iron(III) hydroxide was more effective in adsorbing gold from solution than aluminum hydroxide. However, both hydroxides controlled the behavior of Au(III) complex with very similar manner. The most effective gold adsorption occurred in aqueous solution with near neutral pH and low Cl concentration. In this solution condition, Au(III) complexes were mainly dissolved as AuCl2(OH)2-and AuCl(OH)3-, and the surface charge for both hydroxides was positive. In addition, the adsorbed Au(III) complexes were spontaneously reduced to elemental gold in spite of the absence of a specific reducing agent. The results of this study suggest that adsorption and spontaneous reduction of gold complexes on the surface of hydrous metal oxides with positive charge play an important role in gold precipitation in subsurface environment.

AB - The adsorption of gold on iron(III) and aluminum hydroxides from solutions containing Au(III) complexes has been studied as a function of pH and chloride concentration at 30°C. Iron(III) hydroxide was more effective in adsorbing gold from solution than aluminum hydroxide. However, both hydroxides controlled the behavior of Au(III) complex with very similar manner. The most effective gold adsorption occurred in aqueous solution with near neutral pH and low Cl concentration. In this solution condition, Au(III) complexes were mainly dissolved as AuCl2(OH)2-and AuCl(OH)3-, and the surface charge for both hydroxides was positive. In addition, the adsorbed Au(III) complexes were spontaneously reduced to elemental gold in spite of the absence of a specific reducing agent. The results of this study suggest that adsorption and spontaneous reduction of gold complexes on the surface of hydrous metal oxides with positive charge play an important role in gold precipitation in subsurface environment.

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Role of iron(III) and aluminum hydroxides in concentration/reduction of Au(III) complexes

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